Packaging and Storage Effects on Microbiological Quality of Dried Herbs

Two hundred herb samples were investigated for microbiological quality. Effects of drying method, type package, and storage conditions were determined for dill, basil, marjoram, and wild marjoram. Total aerobic count ranged from 10⁴ to 10⁷/g dried material. Molds and aerobic sporeformers, especially Bacillus cereus, were detected in most samples; fecal indicator organisms were found infrequently. The number of most vegetative microbes was affected by the drying method. Microbes survived air-drying better than freeze-drying. Packaging affected microbial content. The lethal effect of storage time was most clearly shown when the herbs were packed in oxygen-containing packages.